Analysis of the high-statistics UCN$\tau$ dataset

There have been various measurements of the free neutron lifetime $(\tau_n)$ using either cold neutron beams, or ultracold neutrons (UCN) stored in a trap. There is a $\sim4\sigma$ discrepancy in measured lifetimes between the two methods. The UCN$\tau$ experiment at Los Alamos Neutron Science Center uses an asymmetric magneto-gravitational trap to store UCN and counts the UCN remaining in the trap after various holding times to measure $\tau_n.$ During 2017 and 2018, the UCN$\tau$ collaboration gathered roughly seven times as much data as in the 2016 run cycle. Three independent analyses of these data are in progress. We expect our analyses to result in a measurement of $\tau_n$ with statistical uncertainty below $0.3$ s and systematic uncertainty below $^{+0.2}_{-0.1}$ s. Here we present the methods used to extract $\tau_n$ and estimate the statistical uncertainty of the measurement, and outline the methods used to measure the dominant systematic effects.